Fuse plug



Feb. 8,1927. 1,616,771

l... VECCHIO v FUSE PLUG- Filed Jan.-4, 1922 Patentefl F eh. 8, 1927.

UNITED STATES PATENT OFFICE.

LUIGI VECCHIO, OI SCI-IENECTAIDY, NEW YORK, ASSGL\TOR T ELEC'I'RICAL I]\TVEN- TION'S & DEVELOPMEN'L COMEANY, O11 SCHENETADY, NEW YORK, A CORPORA- TION OF NEW YORK.

Application fied. January 4,

. This invention is a thermal out out clevioe for-electric circuits.

One of the objects of the invent1on 1s to pnovide a. fu'se plug 0 simple 'construcon,

SO constructed that the -:Eusible element nmy be readily renewecl, thereby permitting of theindefinitely;continuecl use of the remenii1g elementsflofthe device, A urther obgect is to providesimple meai1s by which the enels Of the.fusibleielement may be anchored 111 positin, t o insure estztblishment of the cirfcuit through the plug; ,A further object is view illustrating a slight modification.

i, Referring t,ov Figures 1,2 and 3 of the dr:iwing, 10 designates an insulat1ng block,

, co'nstiucted of porcelain, or other suitable insulatingmaterial, open at one end 11, and 'clQ'sed at the other, as in'dicated at 12. The

. closfed end is pr'ovidel Wih a boss 18. En-

lo sing the insulating block is a screw shell '14, formngthe shell co'ntact in a manner Well understood in the art, saicl sl1ell having an opening to receive the bossl3. S ;aicl boss. anl sa1d opemng are of any deS1red "'shape which Will prevent relative rotatiouof -these two elements.

The Wall of'the bloek 10, near the open end, is provided With a bere shaped to reeceiv'e a metal contact tube 15, rigidly secured ,to the interiorofthe shell 14, in any clesired manner which Will insure electrical contact therewith. The exterior of the saicl block "10' is -proviled wth a groove 16, in alignmeni: with Saicl 'bore, to provicle the necessary learance for movement ofsaid tube, While the parts are being assembled.

The closed end 12 of the insulating block 10 is provided with a bore, in wbich is secureda metal sleeve 17. The fuse wre 18,

FUSE PLUG.

1922. Serial No. 526,935.

is secured at one end to a splitplug 19, havmg resilient arms normally separated at their treeends, saicl arms being shaped to engage the bere 01 sacl sleeve 17, forthe purpose of ancl1oring the contiguous end of the fuse Wire in place. Said clip is proviclecl with a heacl 20, which serves as the center contact ofthe device. The other end of the fuse wire s insertecl intothe Open end of the tube 15, as shown in Figure 1, and is anchored in place by means of' a suitable clevice, such as the split plug 21.

The open end of the plug is normally c losecl by a cap 22, having a threadecl port1on 23, engaging a, complemental portion 01 the insulating block 10. Said block is proviclecl with one or more lugs 24:, which are positioned to be engaged by complemental lugs 25, projecting from the inner fece of the cap. Both sets 01' lu'gs are positioned inwarclly from the periphery a substantial distance so as to be concealed when the cap is 111 place. By means 01' these lugs the plug may be screwed in its socket by turning the cap in the proper direction.

In practice, the elements of the plug are ussemblecl by placing the b-lock 10 within the shell 14, relative rotation of these parts being prevented by means of the boss 13, and the tube 15. The fuse wire is then passecl inwarclly from the outside, through the sleeve 17, until the arms of' the split plug 19 are brought into frictional engagement with said sleeve, thereby removably anchormg the contiguous end of the wire 18 in place. The other end of the said Wire is passecl over the edge of the open end of the block 10, and bent clown into the contig1ious end of the tube 15, where it is anchored by the split plug 21. The cap 22 s then applied, and the plug is ready for use.

In operation, the clevice is applieclto its soeket in a manner Well understoocl in the art. The head 20 01" the split plug 19 serves us the center contact, and the Wire 18 is conneetecl with the shell contact, through the medium of the tube 15. VVhen the fuse l1as blown, the cover 22 is removed, the plug 19 and the Wire attached thereto are withdrawn, ancl plug 21 is also withdrawn. A new fuse wire may then be substituted 'for the one Wlllcll has been destroyed, by insertng end eenneetng the new wre in the manner already deserbed. Te aved mistake, the amperage or whch the wre is made, may be stamped on tbe head 20ef the plug 19.

In Figure 4 s illustreted a slght medificaten. In ths ferm the nsulatng bleck 25 s previded W1ah a reduced pertion te whieh the shell 26 s permanently seeured. Sad bleck s else prevded Wth a bere te receive tbe sleeve 27, Whch may be cennected te the shel 26, in any deeired manner, sueh es punehng in the sbell, as indicated et 28, and ermng en electrical unen of the parte by seder. Tne fuse wre is anehored in pescen in the manner already descrbed.

The advantuges 01" che inventon Will be read1y apparent te these sklled in the art te which it apperteins. Et will be partcularly ebserved thai when the fuse blews, none ef the eements 01 the device s destreyed, exceptche fuse wire. By const-ructng the pars se ;hat the destreyed Wre may be replaced, y;he remunng parts mey be used ndefinitely. It will else be neted, thai: t-he parte are se erranged that the servces ef an expert are net requred, fior the purpese of making repairs, but thai ercuitthrough the plug s aSsured, just seen as tbe ends 0 Che Wre ere cenneeted se their respeetve anehorng pents. A11 rnpertant edvantege s tbat bndng serews end threaded parte for securng the fuse wre in piace are dispensed Wbh, tbereby resu-tng in a reductien in the cest e1 manufaesure, end eneblng replaeemens te be more rapdly accomplshed wthout necessitatng the use of t001s such, er instanee, es a serew driver.

Having tbus explened tbe nature 0' the invenc-en end described un operative manner or censtrueting end usng tbe seme, a1- theugh wtbout attemptng to set forth 2x11 ef the forme in whieh it may be made, or 2111 of the ferme ef is use, whet is elemed s 1. A fuse plug comprsng un nsulatng bleek, a screw shel enclesng sad bleck end prevded with en internal ceneetmember havng a bere tberen, a fuse wre hzwing one end inserted inte end retained wthin the bere of said centacs; member, end meens anchorng 'Lhe e-ther end ef sad fuse Wre in e manner te prevde a center contaet.

2. A fuse pug cemprsng en insulatng bleck, a screw shell enelosng said bleek end prevded wth an internal tubuar combacia member, a fuse Wire bevng one end inserted nte end retaned wthn one end ef sad tubular eentact member, end means anchorng dee ether end of sed fuse wre in a manner te provide a eenter contaet.

3. A fuse ping cemprs'mg en nsulating bloek, a serew shell enclesng sad nsulating bloek end prevded Wth a centaet member havng e bere therein, a fuse vvre havng one end nserted into the bere ef sad centaci: member, e splt plug sheped to be inserted into the bere ef said centaet member te ancher the centiguous end ef sad fuse wre, end means anehering the ether end 0' the fuse wre in a manner te provide a center contact.

, 4. A fuse plug eemprsng an insulating b1eck havng a lengitudnel bere therein leeding to the top ef the bleek, a cont-ect shell enclesng said bloek end havng an elongated conteemember projeching chreugh sad bere, said centaccmember beng expesed ab one end, a fuse wre havng one end engaging un end e' sad contact member, end meen cenneeted with the other end ef sed fuse wre end removably engagng the insulatng blocks te ferm a center eentact.

5. A. use plug cemprsing 2m insulating bleek, a contact she1l enolosing sad block, a tubular contact member seeured at one end te seid shell end prejeeting threugh said bere, a fuse wre havng one end inserted nte end retaned withn the tubular centaot, end means anchering the ether end of sad fuse wre in a manner te previde a cenber contact.

6. A fuse ping cemprisng un insulatingb10ek having a longitudnal openng therein, e centeet shell enclosng said bleck, a tubular centaet secured et one end te said shell end prejectng tbrough sed epening, a fuse wre bavng one end inserted nto che free end 0 sad tubular cenoaet, a split bleck retaning che inserted end 0' said wire in peston, end means anchorng the free end ef sad fuse Wire in a manner te provde a eenter centact.

7. A fuse plug cemprsing an insulating block closed ai one end and open at the echer, sad elosed end hevng a bere therein, EL contaet shell enclesing sad bleck, a -fuse wre having a splt plug permanently united therete end shaped te rictienally engage sad bere end orm a center contact. whereby the wre and the plug may be inserted end remeved es a unt, end a tubular contact member extended lengtudinally through the Wl-H of the nsulating block and having one end rigdly secured te said shell, the ether end ef sad tubular centact member being exposed end enguged by the downturned end ef sad -fuse Wire.

8. A fuse plug eemprisng an nsulating bloek clesed et one end and open at the etber, sed elosed end havng a bere therein, a centaet shell enelosng sad bleck end prov4ded wth e contact member having one end expesed centiguous to the open end ef sad bloek, end a fuse wire having one end in rctional engagement wth said bere end ermng a center centact, the ether end ef sed wre extending around the open end of the nsulatng block end projecti1g into and havng frctional engagement with the exposed end of said contact member.

9. A fuse plug comprsing an insulatng block closed at one end and open at the other, said closed end havng a bere therein, a second b'ore bengformed longitudinally in the wall of sad block, a contact shell enclosng said block, a tubular contact located in the last named bora and secured to said contact shell, a fuse wire having one end passed throu'gh and in rctonal engagemeht with the bore in the closed end of the insulatng block and provided with means frming a center contact, the other end ofsaid W1Ie beng inserted nto 2m end of said tubula r contact, and a removable anchoring member for the last mentioned k end of sal wre.

tal lugs arranged to abut when the cap has been rotated to a predetermined postion, sad lug being postioned nwardly a, sub stantal dstance from the periphery of the block.

In testmony whereof I have hereunto set 30 my hand.

LUIGI VECCHIO. 

